function ShowWin_rabatt(){
var height=500;
var width=300;
var left=(screen.width/2)-(300/2);
var top=(screen.height/2)-(300/2);	
popup = window.open("http://ewn.se/studenrabatt.htm", "","height="+height+",width="+width+",top="+top+",left="+left+",location=no,menubar=no,resizable=yes,scrollbars=yes,status=no,titlebar=no,toolbar=no,directories=no");
}